Journal
NANO RESEARCH
Volume 12, Issue 11, Pages 2872-2880Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-019-2529-y
Keywords
micro-/nanostructured; metal-organic framework; CoP@NC; rGO; lithium; sodium ion batteries; hydrogen evolution reaction
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Funding
- National Natural Science Foundation of China [21573142, 21903051]
- China Postdoctoral Science Foundation [2018M643569]
- Natural Science Foundation of Shaanxi Province [2019JQ-671]
- Fundamental Research Funds for the Central Universities [GK201903042]
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Rational synthesis of a hierarchical porous architecture with highly active and consecutive conductive network is very critical to achieve the high-performance of nanomaterials in electrochemical energy conversion and storage. We propose here a hierarchical micro-/nanostructured hybrids constructed by the dual carbon shell nanowire host containing CoP nanocrystals of several nanometers, which generates Co-based metal-organic framework on graphene oxide nanosheets in situ and followed a direct phosphorization (CoP@NC/rGO). The dual carbon shell, consisting of Co-based metal-organic framework derived porous doped carbon (NC) and reduced graphene oxide (rGO), can not only impedes CoP nanocrystals from coalescing, and renders highly exposed the electrochemically accessible active sites, but also provides the multidimensional pathways for rapid electron and ion transportation. More importantly, the covered dual carbon shell on CoP nanocrystals plays a role as a protective layer to impede the nanocrystals' corrosion. By virtue of compositional and structural advantages, the micro-/nanostructured CoP@NC/rGO hybrids manifest outstanding energy storage properties when evaluated as anodes for lithium/sodium ion batteries. Remarkably, it also reveals highly efficient electrocatalytic performance for hydrogen evolution reaction in acid media with low Tafel slope, overpotential and robust durability.
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